Horseshoe-calk



(N0-model.)

S. 'STONEl f HORSBSHOB GALK.

Patented Apr. 3, 18.88.

'llNiTED STATES PATENT Ori-ren,

SAMUEL STONE, OF NORTH MANCHESTER, CONNECTICUT, ASSIGNOR TO THE NEVERSLIP HORSE SHOE COMPANY, OF BOSTON, MASSACHUSETTS.

HORSESHOEHCALK.

SPECIFICATION forming part of Letters Patent No. 380,362, dated April 3, 1888.

Application filed August 13, 18H5. Serial No. 174.262. (No model.)

To @ZZ whom it may concern.-

Be it known that I, SAMUEL Sronnof North Manchester, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Horseshoe- Callis, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, and to the letters of reference marked thereon, wherein- Figure 1 is a bottom view of a horseshoe embodying my improvement. Fig. 2 is a view, on enlarged scale, in section on plane denoted by line g/ y of Fig. l, through the calksocket, and showing a calk in side view. Fig. 3 is a detail sectional view, in enlarged scale, of the threaded socket in the shoe. Fig. 4 is a detail sectional view, on enlarged scale, of the threaded calk.

My invention relates to the class of horseshoes adapted for use with removable calks; and it consists in the details of the constructi on and combination of the peculiarly-threaded calk-socket in the shoe and the calk having a threaded stem, as more particularly hereinafter described.

In the accompanying drawings, where like letters denote the same parts throughout, the letter c denotes a horseshoe of ordinary outline and material; I), the calli-sockets in the shoe, which are arranged in any desired position, but usually near the toe and the heel of the shoe; c, the metallic calks, which are secured in the threaded sockets in the shoe by means of a thread eut upon the stem of the calk.

The calk is formed, preferably,with a cylindrical body having the wearing-face c and a threaded stem, c?, and without any shoulder other than that formed at the termination of the thread at the base of the threaded stem.

The great diliiculty with removable calks that are held by means of a thread in a socket in the shoe that have been made prior to my invention has been that the thread in the socket has been uniform in depth and size throughout, whether cut in a cylindrical or a tapered hole,aud this regularity prevented any tightening of the calk in the socket byturning it farther in after it had once become loosened by wear. In the cylindrical form the wear is practically uniform between the respective threads ou the stem and in the socket throughout its length, and any tightening up of such a loosened calk is impossible, even when it has a bearingshoulder resting on the bottom of the shoe, and in the tapered form of stem and socket the attempt to tighten the calk in place tends to strip the thread at the upper end, and a slight backward turn is sufficient to completely release the calk, so that it will drop from the socket. In order to remove this diiliculty, I cut the thread in the socket in the shoe by means of a tap that bears a succession of teeth that diminish in height from the upper end toward the point of the tap, the bottom of the thread of the tap being so cut as to leave a body of uniform diameter practically cylindrical. Such a tap will cut a socket having a thread with the top substantially equidistant from the axis of the socket and the bottom of the thread at a graduallydecreasing distance from the axis in passing from the lower to the upper side of the shoe.

The stem of the calk is cylindrical, with a perfect thread that will dt into a threaded socket in the shoe of the saine gage as the latter, and conform to .it so far as the thread in the socket is completed. rIhe result of an attempt to screw a calk well into the shoe is that the complete thread on the calk will be upset and will jam on the bastard or irregular thread in the socket until thev calk is firmly held in place. After the calk has become loosenedin the socket by wear, such loosening, however, p

being resisted by the whole length of the threaded parts of calk and socket that are in contact, it may be again tightened by screwing it farther in, as by means of a pair of tongs or a wrench, as the thread in the socket decreases in depth toward the top of the shoe. This peculiar arrangement of the imperfect thread in the socket offers such resistance to the inward movement of the calk, by causing the thread to wedge or jam, that it affords a safeguard against the accidental driving of a calk through the shoe and into the hoof, and a space is always left in the upper part of the socket unfilled by the stein of the ca lk to allow for the readjustment of the calk in tightening it, as described.

I claim as my invention- In combination, with a horseshoe having a IOO threaded calli-socket with the top ofthe thread height throughout its length, as and for the substantially equidistant from the axis of the purpose set forth. socket, and the bottom of the thread at a grady nelly-decreasing distance from the axis in passl SAMUEL STONE 5 ing from the lower to the upper side of the Witnesses:

shoe, a removable call: having a cylindrical CEAS. L. BURDETT, stem with a thread of substantially equal A. C. TANNER. 

